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Sladkaya [172]
3 years ago
9

1. (-3x2 + 14x - 11) + (16x2 - 19x+3)​

Mathematics
2 answers:
bixtya [17]3 years ago
6 0

-3×2+14×-11+16×2-19×+3=144

gavmur [86]3 years ago
3 0

Answer:27x-14

Step-by-step explanation: Simplify the expression.

Hope this helps you out! ☺

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Factorise the following.​
spin [16.1K]

Answer:

x²(9x– 11)(9x + 11)

Step-by-step explanation:

81x⁴ – 121x²

The expression can be factorised as follow:

81x⁴ – 121x²

x² is common to both term. Thus:

81x⁴ – 121x² = x²(81x² – 121)

Recall:

81 = 9²

121 = 11²

Therefore,

x²(81x² – 121) = x²(9²x² – 11²)

= x²[(9x)² – 11²]

Difference of two squares

x²(9x– 11)(9x + 11)

Therefore,

81x⁴ – 121x² = x²(9x– 11)(9x + 11)

3 0
3 years ago
Find f(-5) if f(x) = x2 – x + 2.
balu736 [363]
Replace all the x's in the equation with -5. f(5)=(5)2-5+2. > 10-5+2 > 5+2= 7

The Answer is 7
7 0
3 years ago
What is the square footage of a 13 foot by 14 foot circle?
sineoko [7]

{169}ft^{2}


3 0
3 years ago
Write 9 decimals with one decimal place that when rounded to the nearest one round to 7
FinnZ [79.3K]
7.030124314  they all just have to be less then 5
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Read 2 more answers
The total cost, in dollars, to order x units of a certain product is modeled by C(x)=5x²+320 . According to the model, for what
lora16 [44]

Answer:

The minimum cost per unit is obtained for an order of 8 units.

Step-by-step explanation:

Since the total cost is modeled by;

C(x)=5x²+320

Then;

1 unit costs; C(x)=5(1)²+320 = 325

cost per unit 325/1 = 325

8 units costs; C(x)=5(8)²+320 = 640

cost per unit = 640/8 = 80

80 units costs; C(x)=5(80)²+320 = 32320

Cost per unit = 32320/80 = 404

The minimum cost per unit is obtained for an order of 8 units.

7 0
3 years ago
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